v3.26.1
Stock-Based Compensation - Additional Information (Detail)
¥ in Millions
12 Months Ended
Mar. 31, 2026
JPY (¥)
Point
Mar. 31, 2025
JPY (¥)
Mar. 31, 2024
JPY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Points settled for individuals retired 391,898    
Points outstanding 3,268,760    
Stock Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Points granted 632,010    
Stock-based compensation costs recognized | ¥ ¥ 3,705 ¥ 1,778 ¥ 2,177